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19. ( 87Sr/86Sr) t = ( 87Sr/86Sr ) 0+ ( 87Rb/ 86Sr) t (elt -1) Since, it is a lot easier to measure the ratio of isotopes in a sample of rock or a mineral, rather than their absolute abundances. Therefore we divide the above equation by Sr86 The above equation is known as “ISOCHRON EQUATION”. 20. Therefore, with the origin placed at the y intercept, the intersection of the Rb/Sr line and the isochron line can be obtained by solving the equation 1-x = 0.048x, giving the result x = 0.954, which is the rubidium-87/strontium-86 ratio corresponding to the given isochron line.(The corresponding strontium-87/strontium-86 ratio is 1.000 - 0.954 = 0.046) Thus the fraction of Rb87 decayed is 0.954. Since the half-life of Rb87 is 48.8 billion years, we can substitute in the half-life equation The isotope 86 Sr is non-radiogenic in origin and does not change, but 87 Sr is produced by the radioactive decay of 87 Rb. There is no way of anticipating what the 87 Sr is at the time of melt, but if there is 87 Rb present then it will increase with time as the rubidium isotope decays.

(22) Dating Rocks with the Rb-Sr "Isochron" Method There are numerous radioactive isotopes that can be used for numeric dating. All of the dating methods rely on the fundamental principles of radioactive decay, but the specific materials that can be dated and the exact procedures for calculating a date are very different from one method to the next. Age of granite rocks can be determined using Rb - Sr whole rock radioactive dating method and the following age equation, (87Sr/86Sr) = (87Sr/86Sr), + (87Rb/86Sr) (ell - 1) For a suite of representative co-magmatic granitic rocks, the Rb - Sr whole rock isochron plot and relevant data are shown in the diagram. Points are taken from these curves and a plot of fraction Sr-87/Sr-86 (as ordinate) vs.

PDF Petrogenesis of some Proterozoic granitoid suites and

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Docsity.com. Rb/Sr Age Dating Equation 87Rbt =. In this article I shall introduce the Rb-Sr dating method, and explain how it works; in the process the reader should learn to appreciate the general reasoning Oct 3, 2015 Rubidium react with sulfur to produce rubidium sulfide. Chemical reaction.

This Dating Rocks with the Rb-Sr "Isochron" Method There are numerous radioactive isotopes that can be used for numeric dating.
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This new model for 87 Sr accumulation eliminates the need for either long-term decay of 87 Rb, or the acceleration of 87 Rb decay by many orders of magnitude. When diffusive isotope fractionation of Sr isotopes is repeated a sufficient number of times by within-mantle processes on isotopically-anomalous mantle xenoliths (each of which originally had low 88 Sr/ 86 Sr, high 84 Sr/ 86 Sr, and virtually same equation as for Rb/Sr system Sm-Nd method is useful in Ca-bearing rocks because REE substitute for Ca and garnet (high Sm/Nd ratio) Sm-Nd method relatively resistant to alteration ( 1) 144 147 0 144 143 144 143 + - = e t Nd Nd Sm l 1979-01-01 · The Rb/Sr ratio increases in the metabasalts towards the mineralization (Fig. 5). 28 Rb/Sr 0-02" 0'01" 0-00 / e / / / / / / , m 810 I I l I I I 1 I t 60 40 20 ore zone met res Fig. 5. Plot of the Rb/Sr ratio in low grade metabasalts versus distance from massive pyrrhotite-chalcopyrite ore, Snowball deposit.

The corresponding half lives for each plotted point are marked on the line and identified.
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Convert to weight % minerals (W ol W cpx etc.) 2. Use equation … 2014-04-22 virtually same equation as for Rb/Sr system Sm-Nd method is useful in Ca-bearing rocks because REE substitute for Ca and garnet (high Sm/Nd ratio) Sm-Nd method relatively resistant to alteration ( 1) 144 147 0 144 143 144 143 + - = e t Nd Nd Sm l Although the unreliability of the Rb-Sr method for dating is readily demonstrated, 1,2 it is important that alternative models are developed to explain the observed patterns of strontium isotopes. The ratios of 88 Sr, 86 Sr, and 84 Sr, relative to each other, are commonly believed to be invariant throughout Earth materials. However, the ratio of 87 Sr relative to the other Sr isotopes varies 1979-01-01 87 Sr now / 86 Sr = 87 Sr original / 86 Sr + 87 Rb now / 86 Sr * (e lt - 1) Note that this is the equation of a line in the form.

PDF Petrogenesis of some Proterozoic granitoid suites and

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